baber/WOPTO huggingface dataset:
Patent KR-20030048581-A (KR)
Title: Flat type brushless motor for generating vibration
Inventor: PARK YEONG IL
IPC: H02K33/00
Filed: 2001-12-12
Abstract: PURPOSE: A flat-type brushless vibration motor is provided to increase the torque by adjusting the number of coils located on a stator core and an angle of both magnetic poles of a magnet formed on rotor. CONSTITUTION: A stator(100) is comprised of a stator core(101) and a plurality coils(102,103,104,105) arranged on a circumference of the stator core(101) in a predetermined interval. The stator core(101) is fixed on a motor case. A rotor(110) is comprised of a rotor core(111) and a magnet(112). The rotor core(111) is supported by a shaft in a predetermined space with respect to the stator(100). The magnet(112) is formed on the rotor core(111). The rotor(110) is rotated by an electromagnetic force generated between the coils(102,103,104,105) and the magnet(112). An area of which the electromagnetic force is generated corresponds to an area of which two of the coils(102,103,104,105) occupy.
Patent KR-20030048732-A (KR)
Title: A knuckle press machine
Inventor: CHA DONG YONG
IPC: B21D24/00
Filed: 2001-12-13
Abstract: PURPOSE: A knuckle press machine is provided to achieve a smooth shearing surface of an article by fixedly pressing a peripheral portion of a processing part of a plate when performing a blanking process. CONSTITUTION: Length of an upper link(60) is longer than length of a lower link(70). A slider(80) is coupled to a lower end of the lower link(70). A lower frame(110) is positioned below the slider(80). A plate pressing device, which is connected to a hydraulic pressure generator(150) through hydraulic hoses(151), is provided on the lower frame(110). The plate pressing device includes cylinder holes(161,161') formed at a lower portion of the slider(80) and an upper portion of the lower frame(110), respectively, a plurality of first vertical pins(163) formed at a lower surface of a piston(162) accommodated in the cylinder hole(161) of the slider(80), a plurality of second vertical pins(163') formed at an upper portion of a piston(163) accommodated in the cylinder hole(161') of the lower frame(110).
Patent KR-20030049958-A (KR)
Title: Device for adjusting position of roll in grinder cabin
Inventor: LEE SUN HUI
IPC: B24B21/00
Filed: 2001-12-17
Abstract: PURPOSE: A position adjusting apparatus of a roll of a grinding cabin is provided to prevent a strip from generating a scratch or a roll mark not by touching a lower surface of the strip to a billy roll when a billy roll bearing and a surface are damaged. CONSTITUTION: A position adjusting apparatus of a roll of a grinding cabin includes a billy roll(42), a frame portion(11) and a position adjusting portion(21). The billy roll supports a lower surface of a strip(S) upward. The frame portion is arranged to front and rear portions of the billy roll with vertical guide bars(15). The position adjusting portion comprises a rotary motor(23), a rack bracket(24), a roll fixing case(26) and a moving block(29). The rotary motor is installed to an upper side of the frame portion. A pinion gear(22) is fixed to a rotating shaft of the rotary motor. The rack bracket is geared to the pinion gear and installed under the frame portion. The roll fixing case is fixed to an end of the rack bracket and guided by the guide bar. The roll fixing case supports both ends of an upper brake roll(26a). The moving block is lifted up and down by a lifting cylinder(27) installed to a roll fixing base. The moving block supports both ends of a lower brake roll(28). A sprocket(43) is installed to a rotating shaft of the billy roll to separate the billy roll from the strip in a poor operation. A proximity sensor(45) is installed to a cover of the sprocket to sense rotation of the sprocket. A control panel(46) is connected to the rotary motor. Therein, a grinding angle of the strip is formed to hold the strip to prevent vibration. Therein, a chart mark is not generated. A scratch and a roll mark are not made not by touching the lower surface of the strip to the billy roll.
Patent KR-20030050116-A (KR)
Inventor: BAEK JIN U
IPC: B21D24/16
Filed: 2001-12-18
Abstract: PURPOSE: A trimming press system is provided to prevent the trimming press system from being affected by eccentrical impact force through indirectly applying pneumatic force of a cylinder through a lifting block and a selecting block. CONSTITUTION: A trimming press system includes a lower frame(1), a slide(3) installed on the lower frame(1), and an upper frame(7) positioned at a lower outer portion of the slider(3). A steel block(17) is installed at an outer peripheral portion of the lower frame(1). A trim steel(19) is installed at a lower portion of the upper frame(7). The trim steel(19) trims a front end of a panel arranged between the lower frame(1) and a cushion pad(11) when the slider(3) is downwardly moved. A selecting device is installed in the trimming press system for selectively forming a hole to mount an intercooler. The selecting device forms a space portion(15) in the cushion pad(11).
Patent KR-20030050787-A (KR)
Title: Metal wiring in a semiconductor device
Inventor: PARK YEONG BAE
IPC: H01L21/28
Filed: 2001-12-19
Abstract: PURPOSE: A metal line of a semiconductor device is provided to be capable of minimizing the generation of voids and increasing the lifetime of the device by forming a metal atom reservoir at the end portion of the metal line. CONSTITUTION: A lower metal line(13) and an upper metal line are connected with each other by using a plug(16), wherein the plug(16) is formed in an interlayer dielectric. The lower metal line(13) includes a metal atom reservoir(200) formed at the end portion of the lower metal line for compensating the connecting portion between the lower metal line(13) and the plug(16) for metal atoms. Preferably, the metal atom reservoir(200) is capable of being formed at both ends of the lower metal line(13). Preferably, the metal atom reservoir(200) is made of the same material as the lower metal line(13).
Patent KR-20030053659-A (KR)
Title: Conduct roll with less scale
Inventor: KO MUN GYU
IPC: C25D17/10
Filed: 2001-12-22
Abstract: PURPOSE: A conductor roll with less scale generation is provided to prevent corrosion of the inner part of conductor roll used in electro-galvanizing process by cooling water and block scale from being generated by corrosion. CONSTITUTION: In a conductor roll in which a space is formed so that cooling water is circulated in the space, the conductor roll with less scale generation comprises an anode(200) which is traversely fixed to the inner wall of both sides of the conductor roll with being parallel to rotation central shaft of the conductor roll, on which zinc(202) is coated to a certain thickness, and at a certain position of which a plurality of bubble dispersion meshes(204) connected to cavity formed inside the anode(200) are installed to prevent corrosion of the inside of the conductor roll; an anode protector(212) fixed to the outer side of the conductor roll to protect an end part of the anode(200) inserted into the anode protector(212) to a certain depth; and an anode cover(214) which is cohesively engaged with the anode protector(212) so that the anode protector(212) is rotated with the anode cover(214) being fixed to the outer part of the conductor roll, and in which nitrogen injection space and oxygen discharge space reciprocally separated along with the anode protector(212) closely adhered to the nitrogen injection space and oxygen discharge space are formed in upper side and lower side of the water surface of cooling water flown in the conductor roll so as to flow nitrogen of nitrogen supplier to the anode(200) dipped into the cooling water during rotation of the conductor roll and discharge oxygen to air discharger when the anode(200) is positioned on the upper part of the water surface of cooling water.
Patent KR-20030056862-A (KR)
Title: Structure for mounting bottom cover in Liquid Crystal Display
Inventor: BYUN GWAN SEOP
IPC: G02F1/1333
Filed: 2001-12-28
Abstract: PURPOSE: Structure for combining a lower cover of an LCD(Liquid Crystal Display) is provided to improve productivity by combining a lower cover of an LCD with a mold frame without a separate connecting unit. CONSTITUTION: A lower cover(500) is combined to one rear corner of a mold frame(30). A metal sash surrounds the corners of the mold frame. An insertion recess(31) and a matching recess(32) are formed on each side of the mold frame. A tension hook(502) protruding inward is integrally formed in a portion of the lower cover. The tension hook is inserted to the insertion recess. A matching hook(503) protruding inward is formed in a portion on opposite to the tension hook. The matching hook is inserted to the matching recess.
Patent KR-20030059373-A (KR)
Title: Apparatus and method for managing power
Inventor: KIM HAN SEONG
IPC: H02J9/00
Filed: 2001-12-29
Abstract: PURPOSE: A power managing device is provided to manage a battery voltage stably by setting a reference voltage for managing the battery voltage and comparing the reference voltage with the battery voltage. CONSTITUTION: A power control part(102) detects a battery voltage supplied to a system after the system is off and a predetermined time elapses and compares a detected battery voltage with a reference voltage. The power control part controls whether a power is supplied to the system, based on the comparison result. A power switching part(101) receives a voltage for operating the system when the battery voltage is higher than the reference voltage. The power control part outputs a signal for operating the system at a sleep mode when the detected battery voltage is higher than a system off voltage for turning off the system and lower than the reference voltage.
Patent KR-20010082010-A (KR)
Title: Hybrid human/rodent igg antibody to cd3, and methods of its construction
IPC: A61K38/00
Filed: 1999-07-21
Abstract: An aglycosylated IgG1 antibody is provided having a human lambda constant region and having a binding affinity for the CD3 antigen complex in which in the heavy chain has a specified humanised variable region framework together with CDRs and the light chain has a specified rodent variable region framework together with CDRs  CDR1: Thr Leu Ser Ser Gly Asn Ile Glu Asn Asn Tyr Val His   CDR2: Asp Asp Asp Lys Arg Pro Asp   CDR3: His Ser Tyr Val Ser Ser Phe Asn Val   
or a rodent sequence consisting of sufficient of that rodent framework region sequence optionally substituted with some but not all of the human amino acids selected from Asp-1, Phe-2, Met-3, Leu-4, Pro-7, His-8, Glu-12, Pro-14, Lys-15, Ile-19, Ile-20, Gln-39, Arg-40, Pro-41, Ala-44, Val-48, Phe-50, Ser-75, Ser-79, Gly-80, Leu-81, Gln-82, Thr-83, Asp-88 and Tyr-90. 
such as to allow stable light-heavy chain interaction 
for treatment by immunosuppression.
Patent KR-20010074832-A (KR)
Title: 프로필렌계 수지 필름 및 그 제조방법
IPC: C08L53/00
Filed: 2000-06-16
Abstract: 프로필렌계 수지 블록과, 프로필렌과 탄소수 2∼12(단, 3을 제외한다)의 α- 올레핀의 공중합체인 엘라스토머 블록으로 이루어지는 프로필렌- α-올레핀 블록 공중합체로 이루어지며, 이 엘라스토머 블록이 전체 공중합체에 차지하는 비율이 5∼30질량%이고, 이 프로필렌- α-올레핀 블록 공중합체의 크실렌 가용분의 극한점도가 4.0∼6.0dl/g이고, 또한 이 엘라스토머 블록 중의 입자의 특성이 (1) 필름의 유동 방향(MD)의 종횡비가 1∼3인 비율이 50∼100%, (2) 필름의 유동 방향(MD)의 진원도가 1∼1.2인 비율이 60∼95%, 또한 진원도 1.2∼1.4인 비율이 30% 이하, 및 (3) 필름의 유동 방향(MD)의 평균입경이 0.2㎛ 이하인 비율이 45∼80%, 또한 0.4∼1㎛인 비율이 20∼40%이다.
Patent KR-20010075066-A (KR)
IPC: A61K31/785
Filed: 1999-09-13
Abstract: To inhibit, prophylactically or therapeutically, a bacterial, yeast, fungal, or parasitic agent in a patient, an effective amount of a dendrimer is administered to the patient, which dendrimer has a plurality of terminal groups, at least one of which has an anionic- or cationic-moiety covalently bonded or linked thereto. The anionic-containing moiety is not a disaccharide or oligosaccharide moiety, and, where the anionic-containing moiety is a neuraminic- or sialic acid-containing. moiety, it is modified in the 4-position by substitution with an amino, amido, cyano, azido or guanido group, or is unsaturated.
Patent KR-20010080281-A (KR)
Title: Method for constructing a cable-stayed bridge
IPC: E01D21/06
Filed: 2000-08-21
Abstract: The invention concerns a method for constructing a cable-stayed bridge comprising a floor slab (6), at least a tower (4), and inclined stay cables (7) mounted between the tower and the floor slab. The invention is characterised in that after the tower (4) has been erected, the method consists in fixing at least a support cable (10, 14) to said tower, linking the support cable (10, 14) to a section (6a, 6b) of the floor slab, and thrusting said apron section from one end (2, 3) of the bridge, the support cable (10, 14) providing support for the floor slab section (6a, 6b) while it is being thrust.
Patent KR-20010083934-A (KR)
IPC: H04L29/08
Filed: 2000-08-30
Abstract: 분배 서버(103)는 네트워크를 통해 콘텐츠를 분배하고, KIOSK(105) 단말기는 네트워크를 통해 콘텐츠를 수신하고, SD 메모리 카드(100)의 콘텐츠를 기록한다. 고객 장치(111)는 SD 메모리 카드(100)의 콘텐츠를 통해 콘텐츠를 수신하고, 콘텐츠를 체크아웃기록 매체의 카피를 기록한다. SD-오디오 플레이어(122 -124)는 콘텐츠의 카피를 수신하고 그 카피를 재생한다. 여기에서, KIOSK 단말기(105)는 SD 메모리 카드(100)상에서 콘텐츠의 기록을 제어하는 권리를 인증하는 사용 규칙을 기록하고, 권리의 이동이 허용된 횟수를 나타내는 이동 제어 정보는 사용 규칙에 세트된다.
Patent KR-20010080754-A (KR)
IPC: C08L101/00
Filed: 1999-12-09
Abstract: 본 발명의 AOI 조사가능한 라미네이트를 제조하는데 유용한 조성물은 중합체, 1종 이상의 형광 활성 염료 및 1종 이상의 주변광 하에서 가시성인 염료를 포함한다.
Patent KR-20010093818-A (KR)
IPC: H01L21/00
Filed: 1999-12-08
Abstract: 전자모듈(10)의 하나 이상의 커버를 제거하기 위한 방법 및 장치들이 설명된다.  전자모듈은 기판(14)의 실질적으로 편평한 표면에 실장된 반도체 장치(12)들위에 걸쳐 확장하는 커버를 포함한다.  상기 커버는 접착층(22)에 의해 상기 반도체 장치의 주변에서 상기 기판의 표면에 부착된다.  상기 방법은 상기 접착층 및 그 접착층에 인접한 커버의 일부분이 실질적으로 제거되도록 커팅 블레이드(62)를 상기 커버와 상기 접착층에 접촉하는 것을 포함한다.  상기 커버 제거공정 중에, 커팅 블레이드의 하부 표면은 상기 기판의 실질적으로 편평한 표면에 평행한 평면 안에서 이동될 수 있다.  상기 장치의 하나의 실시예는 하나의 커팅 블레이드, 하나의 베이스 플레이트, 상기 모듈에 적응된 하나의 고정장치(50)를 가지는 하나의 커팅 도구를 포함한다.  사용 중에, 상기 모듈은 상기 고정장치 내에 고정될 수 있고, 상기 고정장치는 상기 베이스 플레이트에 고착될 수 있고, 상기 커팅 블레이드의 하부 표면과 상기 기판의 실질적으로 편평한 표면과의 사이에는 바람직한 거리가 설정되고 유지될 수 있다.
Patent KR-20010086136-A (KR)
Title: Method for producing a compound from a flowable plastic material and a solid fiber core by means of extrusion and device for carrying out said method
IPC: B29C48/41
Filed: 1999-12-06
Abstract: Continuous fibers are led through a roller nip which is formed between a pair of wetting rollers which are driven in opposite rotational directions and the surface of which has a coating of the flowable plastic material in a thickness which is sufficient for the constant filling of the roller nip with the plastic material. The wetted fibers are fed to the plastic material in the extrusion chamber, and the continuous fibers are mixed with the plastic material in the extrusion chamber. A device for carrying out the method includes a screw-type extruder having an extrusion chamber surrounded by an extruder barrel which has, in addition to the entry opening and the exit opening for the extruded plastic material, a lateral opening for the feeding in of continuous fiber material, and a wetting device for the wetted fiber material to be fed in, the outlet of which is in transporting connection with the lateral opening.
Patent KR-20010086152-A (KR)
IPC: A61K45/00
Filed: 1999-12-08
Abstract: 세포성 나트륨 수소 교환체 억제제는 노화 관련 기능 장애 및 신체 기관의 기능부전적 변화를 예방하고 노화 관련 질환을 예방하며 수명을 연장하는 한편, 삶의 질을 개선하기 위한 약제 제조용으로 사용된다. 
     대표적인 NHE 억제제에는 통상적으로 화학식 의 카리포라이드 및 화학식 의 에니포라이드가 있다.
Patent KR-20010089713-A (KR)
Title: Surface-treated copper foil and method for manufacturing the surface-treated copper foil
IPC: C25D5/48
Filed: 2000-11-27
Abstract: The present invention is directed to provision of a surface-treated copper foil exhibiting a maximum effect of a silane coupling agent which is adsorbed onto the copper foil and is employed in order to enhance adhesion between the copper foil and a substrate during manufacture of printed wiring boards. The invention is also directed to provision of a method for producing such a copper foil. To attain these goals, a surface-treated copper foil for producing printed wiring boards is provided, wherein an anti-corrosion treatment comprises forming a zinc layer or a zinc alloy layer on a surface of the copper foil and forming an electrodeposited chromate layer on the zinc or zinc alloy layer; forming a silane-coupling-agent-adsorbed layer on the electrodeposited chromate layer without causing the electrodeposited chromate layer of the nodular-treated surface to dry; and drying.
Patent KR-20020003365-A (KR)
IPC: B01D35/147
Filed: 2000-12-01
Abstract: 본 발명은 유체 필터, 특히 필터 하우징 및 필터의 내부 챔버 내로 연장되는 관형 중심 부품을 갖는 내연 기관용 오일 필터에 관한 것이다.  본 발명에 따라, 작동 상태에 있는 중심 부품이 필터 하우징에 배치된 돌출부를 뒤에서 고정시켜서, 필터 하우징 내에 분리되지 않도록 고정되고, 상기 중심 부품은 돌출부와 결합되지 않고도 제공될 수 있으며, 분리 상태에서 파괴없이 필터로부터 빼내질 수 있다.  상기 중심 부품(6)은 종축을 중심으로 필터 하우징(2) 내에 회전가능하게 지지되며, 상기 필터 하우징(2) 내부에 리테이너(10)가 회전이 제한된 상태로 배치된다. 상기 리테이너(10)는 클램프 또는 클립 고정에 의해 작동 상태에 회전 불가능하게 고정되도록 상기 중심 부품(6)을 둘러싸며, 상기 중심 부품(6)은 클램프 또는 클립의 고정력을 극복하면서 분리 상태로 회전할 수 있다.
Patent KR-20010102162-A (KR)
Title: Novel process for preparing alendronic acid
IPC: A61K31/66
Filed: 2000-02-11
Abstract: A novel process for the preparation of alendronic acid is disclosed. The method comprises the steps of reacting a compound of formula I with H3PO3wherein R is an imido group and R1 is selected from the group consisting of chloro, bromo, iodo, fluoro, hydroxy, amino, -OR2 or -OC(O)R2, wherein R2 is C1-C12 alkyl, C1-C12 cycloalkyl or C1-C12 aryl; and then reacting the product of the first step with a deprotecting agent. Alendronic acid is then recovered. The method is safe, efficient and suitable for use on a large scale.
Patent KR-20010112920-A (KR)
IPC: C22C38/04
Filed: 2001-01-23
Abstract: 본 발명은, JIS G 4051 (기계구조용 탄소강), JIS G 4401 (탄소공구강 강재) 및 JIS G 4802 (스프링용 냉간압연강대)에서 규정되는 성분을 함유하고, 탄화물의 전체 갯수에 대한 입경 0.6㎛ 이하의 탄화물의 갯수의 비율이 80% 이상이며, 또한 전자현미경 관찰시야 2500㎛ 2 중에 입경 1.5㎛ 이상의 탄화물이 50개 이상 존재하고, r값의 면내이방성 지표인 △r = (r0+r90-2×r45)/4가 -0.15 초과 0.15미만인 고탄소 강판에 관한 것이다. 단, r0, r90, r45는, 각각 압연방향, 압연방향과 직각방향, 압연방향과 45°방향의 r값을 나타낸다. 본 발명의 고탄소 강판은, 소입성 및 인성이 우수하며, 또한 충분히 높은 치수정밀도로 가공된다.
Patent KR-20020008404-A (KR)
IPC: G01N33/15
Filed: 2000-05-15
Abstract: 본 발명은 간질환, 바람직하게는 알콜-유도 간염의 치료를 위한 잠재적인 치료용 화합물을 동정하는 방법에 관한 것이다.  또한, 간질환의 치료, 특히 알콜-유도 간질환의 치료에 있어서의 본 발명의 방법을 포유동물에게 이용하는 방법, 상기한 방법을 이용하여 동정된 치료용 화합물 및 중국 약초인 CH-100의 이용하는 방법을 개시한다.
Patent KR-20030060532-A (KR)
Inventor: MOON YOUNG IL
IPC: H02K7/075
Filed: 2002-01-09
Abstract: PURPOSE: A flat-type vibration motor is provided to improve a vibration characteristic while reducing a size and a thickness and to reduce a power consumption. CONSTITUTION: Permanent magnets are inserted in a circle plate(10), which is formed using an iron plate for preventing flux leakage, so as to be opposite to each other. An eccentric plate is assembled by push fitting a bearing(14) having a shaft-fixed hole and attaching a brush(13) on an electric insulator(11). A pattern is formed on a printed circuit board(21), and a plurality of coils are disposed in the same angle on a circumference. The coils are attached at a lower case(23) where a shaft(24) is press-fitted.
Patent KR-20030070745-A (KR)
Inventor: CHO BYEONG HUI
IPC: H01L21/50
Filed: 2002-02-26
Abstract: PURPOSE: An apparatus for inspecting and sorting a semiconductor package is provided to rapidly and easily perform a whole process by determining a process according to the selection of an operator and by selectively performing a process. CONSTITUTION: The first absorption plate(48) has a plurality of vacuum absorption holes. The second absorption plate(49) has a plurality of vacuum absorption holes. A cleaning solution injecting nozzle and a dry air injecting nozzle are installed for the semiconductor packages absorbed to the first absorption plate. The first surface image camera(66) takes a picture of the semiconductor package. The second surface image camera(73) is attached to a side of the second absorption plate. An absorption nozzle for taking out a defective product is fixed to a side of the second surface image camera. The first and second turntables receive the semiconductor package from the second absorption plate, including a plurality of absorption holes. The first and second absorption nozzle heads(86,87) for taking out a good product are so installed to move independently of each other. A plurality of absorption nozzles absorb a good semiconductor package, installed in each absorption nozzle head for taking out the good product. A holding unit holds a good tray.
Patent KR-20030072495-A (KR)
Title: I/Q demodulator and a I/Q signal sampling method thereof
Inventor: PARK CHAN SEOP
IPC: H04L27/38
Filed: 2002-03-04
Abstract: PURPOSE: An I/Q demultiplexing apparatus and a method for generating the I/Q signal of the same are provided to reduce the size of the hardware of the low pass filter and the multiplexor to 1/2 without changing the circuit of the conventional I/Q multiplexing apparatus. CONSTITUTION: An I/Q demultiplexing apparatus includes a first and a second multiplexers(21,31) for generating an I signal and a Q signal for the inputted data signals, a first and a second decimation blocks(25,35) and a pair of filter blocks(331,232) for filtering the valid I and Q signals. In the I/Q demultiplexing apparatus, the first and the second decimation blocks(25,35) output the valid I signal and Q signal by performing the decimation for each of the I signal and the Q signal outputted from the first and the second multiplexors(21,31).
Patent KR-20030072808-A (KR)
Inventor: CHO JIN CHEOL
IPC: H04N7/14
Filed: 2002-03-06
Abstract: PURPOSE: A refrigerator is provided to reduce assembling hours, and to cut down manufacturing cost by performing multimedia function for the refrigerator through a mono media controller. CONSTITUTION: A refrigerator is composed of a microcomputer unit(11) controlling total function of the refrigerator and condition for refrigerating or freezing; a display unit(12) displaying information on internal condition of the refrigerator controlled by the microcomputer unit; and a media controller(20) connecting to the external network, and processing signals from the microcomputer unit to display information on the internal condition of the refrigerator through the display unit. The media controller performs total multimedia functions of the refrigerator.
Patent KR-20030073668-A (KR)
Title: Structure for protecting abrasion of reciprocating compressor
Inventor: LEE GYEONG WON
IPC: F04B17/04
Filed: 2002-03-12
Abstract: PURPOSE: A structure for preventing abrasion of a reciprocating compressor is provided to prevent abrasion of a frame or a spring supporting member contacting with resonant springs. CONSTITUTION: A spring unit is joined to both sides of a spring support(51) joined to a mover of a reciprocating motor and a spring to induce resonant movement of the mover and the piston, and comprises a front resonant spring(52) placed on a piston side, and a rear resonant spring placed on a reciprocating motor side. Spring mounting grooves(21a) and spring supporting protrusions(51a) are formed on an inside of a front frame(21), one side of a middle frame, and both of the sides of the spring support facing the front frame and the middle frame to allow both ends of the front resonant spring and the rear resonant spring to be inserted thereto. Surface reinforcing layers(100) are formed on insides of the spring mounting grooves and outsides of the spring supporting protrusions contacting with the front resonant spring and the rear resonant spring with Ni-P coating.